How To Fix CPF091 - Parameter &1, BAdI &2: ASSIGN ... CASTING failed; &3 is an unknown type.

SAP Error Message - Details

• Message type: E = Error

• Message class: CPF -

• Message number: 091

• Message text: Parameter &1, BAdI &2: ASSIGN ... CASTING failed; &3 is an unknown type.

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CPF091 - Parameter &1, BAdI &2: ASSIGN ... CASTING failed; &3 is an unknown type. ?

  The SAP error message CPF091 indicates that there is an issue with a Business Add-In (BAdI) implementation where a parameter is not being recognized or is of an unexpected type. This typically occurs during the execution of a BAdI method where the system attempts to cast a parameter to a specific type, but the type is unknown or not defined correctly.
  Cause:
  
  Incorrect Parameter Type: The parameter being passed to the BAdI method does not match the expected type. This can happen if the BAdI implementation is not correctly defined or if the parameter is being passed incorrectly.
  Missing or Incomplete Implementation: The BAdI implementation may not be fully implemented, or the necessary interfaces or classes may not be activated.
  Transport Issues: If the BAdI implementation was transported from one system to another, there may be inconsistencies or missing objects in the target system.
  Version Mismatch: The BAdI interface may have been changed or updated, and the implementation is not compatible with the new version.
  
  Solution:
  
  Check BAdI Implementation: Review the BAdI implementation in transaction SE19 or SE18. Ensure that the parameters are correctly defined and that the implementation is active.
  Verify Parameter Types: Ensure that the types of the parameters being passed to the BAdI method match the expected types. You can check the method signature in the BAdI definition.
  Activate the BAdI: If the BAdI implementation is not active, activate it. Sometimes, simply reactivating the implementation can resolve the issue.
  Check for Missing Objects: If the BAdI was transported, ensure that all necessary objects (like classes, interfaces, etc.) are present in the target system.
  Debugging: Use the debugger to trace the execution and identify where the casting is failing. This can provide insights into what is being passed and what is expected.
  Consult Documentation: Review the SAP documentation for the specific BAdI to understand its expected behavior and parameters.
  
  Related Information:
  
  BAdI (Business Add-In): A SAP enhancement technique that allows developers to add custom functionality to standard SAP applications without modifying the original code.
  Transaction Codes: 
  
  SE18: To view BAdI definitions.
  SE19: To implement BAdIs.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific BAdI you are working with.
  Community Forums: Consider checking SAP Community or other forums for similar issues and solutions shared by other users.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.